If you take the 5 Medifast meals at approximately 100 calories each, then 300 for the Lean portion equals 800 calories. So yes you can go up to 500 for the total L&G if you prefer, which would equal 1000 calories. The table above I got from Medifast.
So yes you do want to watch calories, carbs, etc. This is a VLCD, Very Low Carb, and High Protien.
If you go too high, you will be out of Ketosis.
http://www.3fatchicks.com/forum/medi...osis-what.html